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Author Topic: Orbite NRHO : comment y mettre une station lunaire (OB1 par exemple)  (Read 626 times)

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Offline jcbenois

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23 April 2021, 17:36:54
Bonjour à tous !

L'orbite choisie pour la Lunar Gateway d'Artemis est une https://fr.wikipedia.org/wiki/Orbite_de_halo lunaire, la NRHO. Comment insérer les paramètres de cette orbite exotique pour OB1 par exemple dans une simulation ? Est-ce que c'est possible ?

Merci d'avance


Offline SCEtoAUX

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Reply #1 - 23 April 2021, 20:03:02
Oui c'est possible. Si tu es à l'aise avec l'anglais:

https://www.orbiter-forum.com/threads/numerical-calculation-of-the-earth-moon-l2-halo-orbit-family.36981/

Quote
This is all the information that you need to insert a vessel on the prescribed point on the prescribed halo orbit at the prescribed time. The simplest way of doing this is to use the Scenario Editor:

1. Open a scenario and select the vessel that you want placed on the halo orbit.

2. Pause the Orbiter program and open the Scenario Editor.

3. Select the date option and paste in the MJD value given in the output and the hit 'Apply'




4. Select 'Done', then 'Edit', then 'State Vectors'.

5. Select the Moon as the 'orbit reference' (make sure that the frame is the 'ecliptic' and the coordinates are 'cartesian').

6. Now paste in the 6 position and velocity coordinate values. At the end of this, you should see something that looks like this:



7. Now hit 'Apply' and unpause Orbiter. Congratulations, your selected vessel is now in an NRHO orbit.

Conrad: I got three fuel cell lights, an AC bus light, a fuel cell disconnect, ACbus overload 1 & 2, Main Bus A & B out.
Carr: 12, Houston. Try SCE to auxiliary. Over.
Conrad: Try FCE to Auxiliary? What the hell is that? NCE to auxiliary..?
Carr: SCE ! SCE to Auxiliary!

Offline jcbenois

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Reply #2 - 23 April 2021, 20:06:59
 :bave: Super !! Merci beaucoup. Je partagerais le .cfg quand j'aurais réussi à paramétrer l'orbite


Offline SCEtoAUX

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Reply #3 - 23 April 2021, 20:14:19
La stabilité des NRHO dépend fortement de l'altitude du périlune. Les orbites de halo avec des périlunes d'environ 7 000 km sont instables et devraient «quitter» l'orbite de la NRHO après environ une révolution sans maintien en poste actif.



Fondamentalement, cela montre qu'il existe des régions de stabilité des NRHO (dans le modèle CR3BP) et celles-ci se produisent lorsque le rayon périlune est très faible; ou quand il fait environ 15 000 km.

Conrad: I got three fuel cell lights, an AC bus light, a fuel cell disconnect, ACbus overload 1 & 2, Main Bus A & B out.
Carr: 12, Houston. Try SCE to auxiliary. Over.
Conrad: Try FCE to Auxiliary? What the hell is that? NCE to auxiliary..?
Carr: SCE ! SCE to Auxiliary!

Offline jmb52

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Reply #4 - 25 April 2021, 09:49:53
J' avais trouvé ça sur le forum orbiter en anglais aussi.

https://www.orbiter-forum.com/threads/lop-g-to-brighton-beach-and-back-again.36984/


Chic planète,dansons dessus